#app {
  margin-left: 200px;
  overflow-x: auto;
  min-height: 100vh;
}

codearea {
  display: block;
  padding: 15px;
  background: #222;
  color: #ddd;
  border-radius: 4px;
}
codes {
  color: #358cd6;
  border-radius: 3px;
  padding: 0 4px;
  // border: 1px solid #358cd6;
  font-size: 14px;
  letter-spacing: 1px;
}

//字体被选中样式修改
::selection {
  background: #58666e !important;
  color: #fff;
}
::-moz-selection {
  background: #58666e !important;
  color: #fff;
}
::-webkit-selection {
  background: #58666e !important;
  color: #fff;
}
.back_top {
  position: fixed;
  bottom: 35px;
  right: 0px;
  background: #ccc;
  z-index: 1000;
  width: 42px;
  height: 42px;
  text-align: center;
  line-height: 42px;
  border-radius: 4px;
  cursor: pointer;
  &:hover {
    font-size: 16px;
  }
}
